Machine tool



June 9, 1,942- N. P. DARAISH 3 7 MACHINE TOOL Filed 4 m so, 1940 I 9 sheets-sum 1 INVENTOR. DAEHJH ATTORNEY? June 9 1942. N. RDARASH momma TOOL Filed April 30, 1940 9 Sheets-Sheet 2 ATTORNEYS R 0H. Q 0f N. P. DARASH 2,285,571

MACHINE TOOL Filed April 30, 1940 9 Sheets-Sheet 3- INVENTOR. I

ILIA'III ATTORNEYS Ju e 9, 1942 Jun 9,1942.

N. P. DARASH MACHINE TOOL Filed April30', 1940 9 Sheets-Sheet 4 m m m m 0 j t Junie 9, 1942" .N. P. mus" mourns moi. Fiied April 30. 19 0 9 Sheets-Sheet 5 INVENTOR.

ATTORNEYS am 9, 1942. 'N. DA'RASH 2,285,571"

MACHINE TOOL Filed April 30, 1940 9 Sheets-Sheet 6 INVENTOR.

QL BY v hlcuoms 2 0920s June 9, 1942. i N. P. DARASH MACHINE TOOL Filed ri; so, 1940 9 Sheets-She et '7 INVENTOR. k w, H/cHouw P. Omens Q {Q BY ATTORNEYS June 9, 1942. N.- P DARASH mm-1mm r001, 'Filed April 30, 1940 9 Sheets-Sheet 8 June 9, 1942. N. P. DA-RASH MACHINE TOOL Filed April 30, 1940 9 Sheets-Shet 9 INVENTOR. M'cHoL/m I? 0nensu Patented June 9, 1942 MACHINE TOOL Nicholas P. Dal-ash, Cleveland, Ohio, assiznor to .lfhe Warner & Swasey Company, Cleveland, Ohio, a corporation of Ohio Application April 30, 1940, SerialNo'. 332,517

29 Claims.

This invention relates to a machine tool'and more particularly to a control device preferably in the form of a unit attachment which is operatively associated with the indexible member or and disconnecting the device from its source of power. a. 7

Further and additional objects and advantages not hereinbefore specified will become apparent members of a mechanism for selecting or pred g e detailed desel'iptien which 15 o follow selecting the different rates of movement of a of an embodiment of the invention. Referring movable part of the machine tool and which unit to e a ompa y drawings illustrating Said functions to index said member or members. embodiment of the invention,

An object of the invention is to provide a con- 1 is a on elevfltional View of a machine trol device for the indexible member or members tool to which the invention is applied. of a selecting or preselecting mechanism for a Fig. 2 is a transverse ver i al Sectional View movable part of a machine tool and which device through the ds k 0f e mac ne tool shown can be preset to enable the rates of movement in wi the unit attachment m o y n which are to be imparted to said part for the the present invention Omitted, Said View being difierent operative steps of a work cycle to be taken approximately 1 e 2 0! Fi 100 sequentially selected or preselected during said 111g in the direction of he arrowswork cycle, Fig. 3 is a fragmentary sectional view taken Another object is to provide a control device ppr y 011 li -4 1' 5 looking in such as specified in the last named object and the direction of h which device may be operated-manually or auto-. 4 i a detached detail e 0f p S w matically as desired to index the indexible memin i 2 a is partly in elevation and partly her or members of the selecting or preselecting in Seetiehmechanism ofa movable part of a machine mm Fig. 5 is a transverse horizontal sectional view to obtain the difierent rates of movement for through the headstock taken Substantially 011 said partfor the difierent operative steps of a line of 2 0 81 the direction of t e work cycle. w a Y A further object is to provide a control device 6 is a, fr m n ary Sectional view taken operatively associated with the mechanism for Substantially On n of F 10 king in the selecting or preselecting the different rates of direction of the r movement of a movable part of a machine tool 71S developed View 0f the rin in the for the difierent operative steps of a work cycle headstock and which device can be adjustably preset in 8 is an end ienel view of the headaccordance with the different rates of movement swck of t machinetool Show! in 1 with to be selected or preselected for the diflerent the unit attachment embedying the p sent i11- operative steps in the cycle. and then looked Ventieh mounted thereona I against unauthorized alteration of the preset e 9 is detached elevational view e arrangement. unit attachment on a larger scale and looking A further and additional object is 'to provide at said ni from the left of Fig. 8.

a control device for the selecting or preselecting 10 is 9? P P View Of the unit t ac mechanism of a movable'part of a machine tool ment shown in p and which device includes an indicator for indiis sectional View of the unit t cating the rates of movement of said a t, t merit and is taken substantially on line H-ll gether with means associated therewith such F1513 t that said indicator will always show during each g 12 is F of the unit attachment Partly operative ste the rate of movement of said part m op P with the top plate and p dlal the indicator removed, the portion in sectionv for said step and will not indicate the selected being taken substantially on line H '2 I Fi or preselected rate of movement for the succeed- Fig 13 is an irregular Vern al 1 0 1 ing step until the start of the operation of the sec through the umt attachment and is taken submachme in Said Succeedme stevfiflstantially on line 13-43 of Fig. 11.

A further object is to provide a control device Fig 14 is a fragmentary irregular vertical secfor the mechanism for selecting or preselecting tional view through the unit attachment and is the rates of movement of a movable part of a taken substantially on irregular line H-l4 of machine tool and which device is power operated Fig. 15 looking in the direction of the arrows. and includes means for automatically connecting Fig. 15 is an irregular fragmentaryhorizontal fixed to a shaft 44. in mesh with an idler gear 45 suitably supported sectionalwiew through the unit attachment and is taken substantially on line |-|5 of Fig. 14.;

' and show different relationships assumed bysaid parts during the operation of the unit. i 7 Fig-20 (sheet 5) is a fragmentary sectional 'view taken substantially on line 20-29 ofFig.

15, looking in the direction of the arrows.

Fig. 21 (sheet 4) is a fragmentary sectional view similar to the lower left hand portion of Fig. 12 but showing the parts in different positionr Fig. 22 (sheet 8) is a detail sectional view taken substantially on line 22-22 of Fig. 14, looking in the direction of the arrows.

Fig. 23 is a fragmentary detail sectional view taken substantially on line 23-23 of Fig. 1'1, looking in the direction of the arrows.

Fig. 24 is a detached and fragmentary sectional view corresponding to the upper right hand portion of Fig. 13 but showing the parts in different position, and

Fig. 25 (sheet 1) is a fragmentary elevational' view, with the housing boxon the end of the head cover shown in section, said section being taken on line 25-25 of Fig. 8. v

The machine tool shown herein by way of example is a turret lathe and comprises a bed 30 provided with ways 3| on which is slidably mounted a turret slide 32 and a cross slide carriage 33. The headstock 34 of the turret lathe is located at one end of the bed and is provided is parallel to the ways 3|.

The unit attachment embodying the present nisms for other movable parts thereof.

The work spindle 35 may be driven, in this instance, at any one of twelve. different speeds in either the forward or reverse direction by means of change speed gearing located in the headstock and now to be described.

i In thepresent example the source of power for driving the spindle is derived from a belt pulley 36 fixed on a main drive'shaft 3 1 that has splined thereto a shiftable clutch element 38 located intermediate clutch elements 39 and 40 which are freely rotatable on the shaft 31 but held against axial movement. The clutch element 39 has formed thereon a gear 4| while the clutch element 40 has formed thereon a gear 42. The gear 42 is constantly in mesh with a gear 43 The gear 4| is constantly in the headstock and which meshes with a gear 46 also fixed to the shaft 44. It will be seen that the shaft 44 can be driven in either the forward or reverse direction from the shaft 31 de-.

moved to any one of three different operative positions to engage the gears 41, 48 and 49, respectively, with gears 50, 5| and 52 fixed to a shaft 53, wherefore it will be seen'that the shaft 53' can be'driven at any one of three different speeds in either the forward or reverse direction.

The gear 50 is constantly intermeshed with a gear 54 formed on a gear sleeve 55 that is freely rotatable on the spindle 35 but held against axial movement. The sleeve 55 is also provided with a gear 56 and this gear and the gear 54 can be selectively intermeshed, respectively, with the gear 51 or 58 of a rear two-step gear cone splined ona shaft 59. It will thus be seen that the shaft 59 can be driven at any one of six different speeds in either the forward or reverse direction.

A front two-step gear cone is splined on the shaft 59 and is formed of the gears 60 and GI which can be selectively intermeshed, respectively, with gear 62 or 63 fixed to the spindle 35, wherefore the spindle can be driven at any one of twelve different speeds in either the forward or reverse direction.

The shiftable clutch element 38.is shifted to either one of its engaged positions or to a diswith the usual work spindle 35, the axis of which engaged or neutral position by means of a yoke 64 that straddles the annular groove in the shiftable clutch element 38 and is formed on a sleeve 65 slidably mounted on a rod 66 supported in the headstock. The sleeve is provided on its upper side with a groove in which is located the rounded end of a lever arm 61 that is fixed to the lower end of a vertically dependingshaft 68 rockably mounted in suitable bearing supports formed in the cover 99 of the headstock (see.Figs. 2 and 5).

The shaft 68 is integral with a cylindrical bearing portion 10 of 'a member 1|. The said bearing portion 19 of the member 1| is rotatably mounted in an opening in the cover 69 of the headstock and said member has pivotally mounted therein on a horizontal axis a control lever 12 that extends from the member toward the front of the headstock through a relatively narrow elongated slot 13 formed in the member and permitting pivotal movement of the lever 12 about its horizontal axis. It will be understood,

however, that when the lever 12 is moved in a horizontal plane the member 1| will be rocked will be rocked and effect a movement of the sleeve 55 and yoke 64 to shift the shiftable clutch element 39.

The three-step gear cone on the shaft 44 is shifted to either one of its three operative positions by means of a sleeve 14 slidably mounted on a rod 15 and provided with a downwardly extending portion, the lower end of which is forked and straddles the gear 48. The sleeve 14 is provided with an upwardly and laterally extending portion having'a forked end 19, see Figs. 2 and 5, in which is located the rounded end of a lever arm 11. The'lever arm 11 is fixed to the lower end of a vertically depending shaft 18 rockably mounted in suitable bearings formed in the cover 69 of the headstock. The shaft 18 has fixed to it a lever arm 19, the free end of which is provided with a pin 80. 'It will be seen that when said lever arm 19 is moved the shaft 18 will be rocked to cause the lever arm 11 to swing and move the slide 14 with a resultant endwise movement to the three-step gear cone to bring any one of the three gears thereof into mesh with its mating gear.

The rear two-step gear cone on the shaft 59 is shifted to either one of its two operative positions by-means of a lever arm 8| rockably mounted on the shaft 18 and provided on the underside of its free end with a pivoted shoe 82 that straddles the gear 51. The free end of the lever arm 8| on its upper side is provided with a pin 83 which will be referred to later.

The front two-step gear cone is moved to either one of its two operative positions by means of a lever arm- 84 fixed to the lower end of a vertically depending shaft85 rockably mounted in suitable bearings in the cover 89 (see Fig. 3).

The lever arm 84 is provided atits free end with a pivoted shoe 86 that straddles the gear 6|. A second-lever arm 8'! has its sleeve portion fixed to the shaft 85 and its free end pivotally connected to one end of a link 08 theopposite end of which is pivotally connected to the free end of a bent lever arm 89 that is freelyrockable on the shaft I8 (see Fig. 6). The link 88 and the free end of the bent lever arm 89 at their point of pivotalconnection are provided with a depending pin 90 the purpose of which will later be made clear.

It will be seen that if movement is imparted to all or some of the pins 80, 83 and 90 the lever arms and other parts associated therewith will be moved to shift all or some of the shiftable gear cones of the change speed transmission to vary the speed of the work spindle 35.

As illustrative of one form of mechanism for selectively moving the pins 80, 83 and 90 the following is employed. A shaft 9| is rotatably supported in the cover 69 of the head-stock and this shaft has splined thereon a pair of similar spools 92 and which are provided on their adjacent faces with cooperating series of long and short projections, short and long projections and projections of equal length.

A annular grooves formed in the spools 92.

The shaft 9| may be rotatably indexed to index the spools 92 to bring certain of the cooperating pairs of projections on the adjacent faces of the spools into operative relationship relative to the pins 80, 83 and 90, which pins it will be understood are located intermediate said adja-.

cent faces of the spools. The shaft 9| is extended through an end wall of the cover 89 of the headstock and has formed on its outer end a gear 93, see Figs. 1, 8 and 25. The gear 93 meshes with a gear 93a fixed to the inner end of a short shaft 94 supported by the housing box 95 and having fixed to its outer end a hand wheel 99, whereby said shaft 9| and spools 92 may be manually indexed.

The gear 93a meshes with an idler gear 93b rotatably supported on a suitable bearing pin carried by the housing box 95, and said idler gear in turn meshes with a gear 91 fixed to one end of a short shaft 98 that extends into the box 95 and is supported in the cover of theheadstock, and has fixed to its opposite end a spiral gear 99. The spiral gear 99 meshes with a gear later to be referred to that is operatively con-' nected with the parts of the control and indicating unit attachment embodying the present invention and which unit is mounted on the top of the cover 69 of the headstock and acts to automatically power index the shaft 9| and'the spools 92 and to indicate the different spindle speeds as well as the cutting speeds in feet per minute for the different operative steps in the work cycle.

The spoolsare moved endwise toward and away from each other with an equalized movement by means of similar sleeves I00 slidably mounted on spaced parallel rods |0I supported in the cover 89 of the headstock. The sleeves I 00 are provided on their adjacent sides with An equalizer bar I08 is rockably mounted on the underside of the cover 69 and its opposite angularly disposed ends are provided with pivoted shoes I 04 located in transverse'grooves formed'in the upper sides of the sleeves I00. The pivotal connection between the equalizer bar I03 and the cover 99 is in the form of 'a bearing sleeve I05 integral with the equalizer bar and supported in a bearing boss I06 formed on the underside of the cover 89. The bore in the sleeve I05 has a polygonally shaped portion I01 and a cylindrical portion I08 for-a purpose later to be explained.

A bell crank lever I09 is rockably supported on a bearing pin 0 depending from the underside of the cover 69 and one arm of said lever is provided with a spherical portion III at its free end which engages in a recess I I2 formed in the side of one of the sleeves I00 i. e., the right-hand sleeve, as viewed in Fig. 5. The other arm of the bell crank I09 is provided at its free end with a'forked portion I I8 which carries a flanged bushing H4 in which is located the rounded lower end of a lever arm H5 depending from the shaft IIG that forms the horizontal axis for the control lever 12 in the member II, said lever arm I I5 extending through the bore in the bearing portion I0 of the member II, as clearly indicated in Figs. 2 and 4.

It will be seen that when the control lever I2 is rocked about its horizontal axis, i. e., moved in a vertical plane to and from full line to dash line position of Fig. 2, the shaft I It will be rocked and the lever arm II5 moved to rock the bell crank I09, and such movement will be transmitted to. the right-hand sleeve I00 to move the .latter linearly-and through the equalizer bar I03 impart similar and equalized movement to the other sleeve I00 but in the opposite direction to cause the spools 92 to move towardor from each otherwith an equalized movement or from the position shown in Fig. 6 to the position shown in Fig. 5 or vice versa.

in order to normally hold the spools 92 in.

their separated or indexed position, i. e., the position of Fig. 6 and the control lever I2 in its raised or elevated position, i. e., 'the dash line position of Fig. 2, the cover 69 of the headstock is provided. interiorly with a spring-pressed plunger III that engages against a heel formed on the bell crank I09, as clearly indicated in Fig. 5.

As previously stated the unit attachment embodying the invention is mounted on the top of theheadstock which has a machined surface upon and to which the unit is positioned and secured. V j

Heretofore it has been customary to mount in a similar position on the headstock an indicating device which is operatively connected with mechanism for selecting or preselecting the different spindle speeds and the unit attachment contemplated by the present invention-is of such character that it can be interchangeably used in place of the indicating device just referred to, it being remembered that the said unit attachment embodying the invention includes an indicating device that is operatively connected with the mechanism for selecting or preselecting the spindle speeds and also a control device which can be preset and which functions to index the indexible members of said mechanism to select or preselect manually as desired.

The unit attachment is shown detached in elevation and in top plan in Figs. 9 and 10, 'respec'- tively, while in Figs. 1 and 8 it is shown in elevation mounted on top of the headstock on the machined surface of the cover 69 thereof.

The unit comprises a housing II8 which is 1 formed of two main portions, namely, a portion for housing the indicating device of, the attachment and a portion in which the control device thereof is housed as will later be made clear.

hold indicating blocks I39bearing numerals corersponding to the different operative steps of a work cycle and which will be employed in coni nection with the manualindexing of the drum .and the spools 92 in presettin'g the unit or in manually operating the same when the automatic function thereof is not desired.

.Above thetapered or conical portion I30 of the hub I29 of the drum there is arranged loosely fonthe shaft II9 a clutch element I40 having a tapered r conical clutch face engaging the clutch face of. the portion I30. The element I40- on its The portion of the housing II8 of the unit in which the indicating device is located is provided with a vertically extending shaft IIO rotatably supported in the housing and having on its lower end a spiral gear I which meshes with the spiral gear 99 on the short shaft 90 that is carried in the cover 69 of the headstock and isoperatively connected with the hand wheel" 93 as above explained.

A gear I2I having an elongated sleeve the housing H8, see Fig. 13. The purpose of the gear I2I will be referred to hereinafter.

. is keyed.

to the shaft II9 between the spiral gear I20 and the lower end of an internal hub I22 formed in upper sideis provided with an upwardly extends ing fork in' which is supported a roller MI in the form of anantigfriction'. hearing. The clutch face ofthe, element I40 is held in clutched engagementiwith the portion-I of the drum by an internal shoulder formed in the enlarged pertionof acover sleeve" I42 which is connected to v the. drum I21-by means of a number of screws I43 that extend through the enlarged portion of thecoverslee've and are screwed into suitably threaded openings in'the partition I28 of the drum, see Fig. 13. 1 w

The shaft II9 adjaoent to the upper end of the internal hub I22-is provided with a threaded portion I23 upon' which is screwed the lower end of a sleeve I24 mounted on the shaft andhaving its lower end bearing upon the upper end of the hub I22 and provided with a flange I25 supporting an anti-friction bearing I26.

It will thus be seen that the clutch element I40 .during'assembly'can be adjusted relative tothe drum-to position the roller In in any desired location and },then clamped to the drum by means of the 'cover sleeve I42 and screws I43 to form a substantial part of the'drum and move therewith".

' as aunit.

An indicating drum I2! is'mounted in the housing II8 for rotation-therein, and said drum is provided intermediate its ends with a partition I28 at the center of which is an. integral sleevelike portion I29 that surrounds the sleeve I24 and has its lower end supported by the bearing I26 while its upper. end .above the partition I28 is tapered or cone-shaped, as indicated at I30.

The shaft H0 is provided with a second threaded portion ,I3I adjacent the upper end of the sleeve I24 and .a nut I32 is screwed on said second portion and engages the l pper end of the sleeve I24 to clamp said sleeve to the shaft I I9 so that it will rotate therewith.

It will be noted that the sleeve I25 forms the bearing upon which the drum I27 can rotate and ball bearing I26.

that the weight of the drum is supported by the It will be understood that the drum I21 on its periphery is provided with suitable indicia representing the twelve different spindle speeds in relation to cutting speeds in feet per minute for different diameter work pieces and said indicia by the rotation of the drum can be brought into position in the window I33formed in the housing In order to indicate the spindle speed'selected or preselected and to which the drumihas been indexed, the cover I34 of the housing. I I8 is provided with a fixed pointer I35.,'see Fig. 9, while- 1 the drum I21 above the cover is provided with-a conical flange I36 on the outer surface of which are a plurality of pointerm'arks I3! which can be brought into alignment with the-fixed pointer The drum above the flange I36 is extended to provide a cup-like portion above the partition I28 and the wall of said cup-like portion is proyided with a plurality of vertically. extending slots I38 forming continuations of the marker lines I31 and adapted to removably receive and.

and hassplined-to its upper end a cam member I44. The cam surface ofthe member I44 is at the inne'rorjlower end thereof and is held in engagement with the roller MI .by a coil spring I45 having its opposite ends abutting a flange on the cam member and a'flanged washer I46 secured to the end of the shaft I'ISby bolt I41.

It will be appreciated that the spring I45 tends at all times to urge'the cam member I44 downwardly and to maintain the camming surface thereof in contactwtih'th roller MI. The upper end of the sleeve housing I42 is closed by means of a dust cap I48thatis screwed into the i threaded centrally'disposed opening at the end of the sleeve.

It will be; seen that. when the shaft '9 is rotated the cam member. I44 will turn therewith and, due to the engagement of its cam edge on the roller I'4I,'will impart. turning niovement. to the. drum unless-said drumis held by other means against such movement. However, when the drum is held against, turning movement by means later to be referred to, the turning of the shaft 9 will cause the cam surface of the member I44 to move relative to the roller I from the low point'oflthe cam surface, as shown in Fig. 24, toward the high. oint thereof as shown in Fig. 13,'with vthe result that the spring I45 is compressed. Consequently when the lockin means which has been referred to is retracted and the drum released; the spring 145,; acting on the cam member I44 will produce a rotation of the drum relative to the shaft I I9 until the roller has" again reached the low point of the cam surface as shown in Fig. 24.

It will be understood that if the rotation of the shaft I I9 when the drum is locked against rotation has caused the roller to move. to one' control device is II8 of the unit attachment has secured thereto a flangedmotor into the portion I49, the shaft of which extends of the housing in which the located. The motor shaft has secured thereto a friction clutch element I50 of the cone type and which is located within the tapered bore of the enlarged end -II of a worm shaft I52 that is rotatably supported in the housing so as to have limited endwise movement.

The end of the shaft I52 opposite to the enlarged end I5I is incontact with a spring-pressed plunger I53 which acts to force the shaft into clutch engaged position, as will be readily understood. The shaft I52 intermediate its end is provided with a worm I54 which meshes with a worm wheel I55,.see Figs. 11 and 13. The worm wheel I55 is rotatably mounted in a bore formed internally of the housing and is operatively connected to a sleeve I56 by means of a positive jaw clutch as indicated at I51. The sleeve I56 is rotatably supported in the housing and is provided with a centrally disposed bore in which is movably mounted a clutch actuating pin I56 having a tapered portion contacting the jaws of the clutch and a threaded portion engaging a threaded portion of the bore in the sleeve I56, wherefore said pin I58 can be screwed by rotating the knob I59 inwardly or outwardly to eii'ect engagement or disengagement of the clutch.

It will be understood that when the positive clutch is disengaged the worm Wheel I55 may rotate freely on the sleeve I56 and when said The buttons the operator releases the button clutch is engaged rotation of the worm wheel I55 will cause rotation of the sleeve I56. The lower end of the sleeve I56, as viewed in Fig. 13, has fixed thereto a gear I60 which, in turn,

meshes with a gear I6I which is freely rotatableon a supporting sleeve I62 mounted in the housing. in mesh with the gear I2I previously referred to.

It will be seen that rotation of the sleeve I56 will effect, through the gearing just enumerated, rotation of the shaft H9 and in turn rotation of the drum I21. The sleeve I56 is provided with a plurality of stop disks I63, each of which has a radially projecting lug I64. The inner circumferences of the disks I63 are provided in this instance with thirteen teeth I65, representin the twelve different spindle speeds and a neutral position.

It will also be noted that there are eight disks I63 on the shaft I56, since, in this instance, the maximum number of operative steps in the work cycle will be eight. The sleeve I56 is provided with eight spring-pressed plungers I66, said plungers being arranged in a series extending longitudinally of .the sleeve so that each plunger will cooperate with the teeth I65 on a disk I63, as clearly indicated in Figs. 12 and2l.

It will be seen that when a disk I 63 is held against rotation and the sleeve I56 rotates in-a clockwise direction, the plunger will idle over the teeth I65, but when the sleeve I56 rotates in an anti-clockwise direction the plunger I66 will act as a positive key locking together the sleeve and the disk I63.

In order to adjust the disks I63 to position the lugs I64 in various predetermined circumferential positions related to spindle speeds the The idler gear I6I in turn is constantly .formed on the inner ends of following mechanism is employed: The housing H8 carries a vertical series 01' horizontally extending. slidable locating pins I61, as shown in dotted lines in Fig. 9 and in full lines in Figs. 12 and 2l. grooved, as indicated at I68, to receive a lug buttons I69 that are slidably carried in a plate I16 secured to the front of the housing, it being noted that there are eight of these buttons to correspond to the number of pins I61 and that said buttons are staggered, so that eachone is operatively connected with a corresponding pin (see Fig. 9).

I69 are urged in an outward direction by springs HI, and the outer end of each button is provided with a numeral or other indicia to indicate an operative step in the work cycle.

It will be seen that when a button I69 is pressed in against the action of the spring I1I its corresponding pin I61 will be moved from the position shown in Fig. 12 into the position shown in Fig. 21, at which time the inner end of the pin I61 will lie in the path of movement of the lug I64 on its corresponding disk I63.

In adjusting the relative positions of the lugs I 64 the operator presses the button I69, that corresponds to a certain operative step in the work cycle, inwardly to move the corresponding pin I61 inwardly to the position shown in Fig. 21, and then turns the hand wheel 96 to efi'ect, through the gearing indicated in Figs. 13 and 25, a'rotation of the drum I21 and a clockwise rotation of the sleeve I56 until the lug I64 engages the pin I61 and the desired spindle speed on the drum I21 for the particular operative step is brought into line with the pointer I35, whereupon I69 and allows 'the same to return to its outer and normal position under the action of the spring I1I to withdraw the pin I61 to the position shown in Fig; 12.

It will be seen that the clockwise rotation of the sleeve I56 when the pin I61 is in the position shown in Fig. 21 will cause a simultaneous clockwise rotation of the particular disk I 63 until the lug I64 engages the inner end of the locating pin I61, inasmuch as the pressure of the springpressed plunger I66 will be sufiicient to cause the disk to move with the sleeve. However, afterthe lug I64 has engaged the inner end of the locating pin the continued clockwise rotation of the sleeve I56 cannot efiect any further rotation of the disk I 63 and the plunger or key I66 will merely idle over the teeth I65 with a ratchet action.

It will be understood that when the lugl64 engages the pin I61 the operator will rotate the hand wheel 96 to effect a continued clockwise rotation of the sleeve I56 until the desired spindle speed is indicated on the dial drum by the pointer I35. However, since he cannot actually see the engagement of the lug with the locating pin the operator can detect by the feel of the hand wheel the ratchetaction of the plunger I66 over the teeth I65 after the lug has engaged the pin I61 and then by observing the dial can tell when he has correctly moved the sleeve I56 relative to the disk I63 to locate the plunger I66 inpredetermined relation to the disk corresponding to the desired spindle speed. v s g In actual practice, and as a matter or pre-' caution orsafety, the operator will normally give a complete revolution to. the hand wheel 66 so that he will definitelyknow the lug I64-is in engagement with the pin I61 and then he will continue the rotation of the hand wheel I96 while The outer ends of the pins I'61 are button I89 as previously referred to.

of adjustment is followed for each of the opera justed 'in' relationship observing the indicating dial until the desired spindle speed is brought into line with the pointer I85, after which he releases his pressure on the This mode tive steps in the work cycle, that is, if there are four steps in the cycle, the operator will depress successively the buttons corresponding to such steps to adjust the disks I03 likewise corresponding to said steps;

tion of the circumference of which flange is provided with circumferentially spaced teeth. I88,

- there being eight of these teeth to correspond to is operatively connected to a movable lock pin I that isflprovided with an axial series of circular grooves in-line with the pins I01 and whichdock pin cooperates-with recesses formed in the pins It will be seen that when the pins m are m their'normal retracted position as shown in Fig.

'. 12 and the lock I12- has been operated to'move the lock pin I13 into position to bring its circumference into the recesses in the pins 101, no inward movement can be given to the pins 161 by the buttons I59. However, when the lock is operated to unlocked position the annular grooves in the lock pin I13 are so located relative to the wardly by the buttons I00, as shown in Fig. 21.;

Rockably supported in the unit attachment is I14 which has a bearing shaft a gear segment portion I15 rockably mounted in-the bottom wall against the upper side of the cover 09 of the headstock and has extending downwardly therefrom areduced cylindricalportion interfltting' the cylindrical portion I08 of the bearing sleeve 405 and having at its lower end a polygonal por tion I11 which interiits 'the'polygonal portion I01 of said bearing sleeve of the equalizer bar 103.

It will be seen. that rockin movement imparted to the equalizer ban I08 by mechanism heretofore explained will in turn iinipart rocking movement to the gearsegment I10- due to the driving relationship shaped portion I01 of the bearing sleeve I05 and between the polygonal" Secured in the stop drum the eight operative steps in the work cycle, as.

has been assumed for purposes of illustration.

I85.so as to extend transversely of the annular groove I88 is 'a pin I89, the purpose of which will later be pointed out. The stop drum I85 just below the cover 134 is provided with a segmental shoulder I90 to form clearance for an adjustable abutting or stop screw I9I which is mounted-in th housing.

H8 and canbe adjusted from exteriorly there- 'of see Figs. 12 and'20. The stop drum carries a fixed stop-pin 192 which registers with and abuts against the stop screw. I9I when the drum is rotated in an anti-clockwise direction as viewed in Fig. 12. The rotation of the drum in the anti-clockwise direction is efiectedby mechanism now to be explained.

A washer 193 is mounted on the bearing portion of the drum above the cover I34 and is held in fixed non-rotative position by meansof a pin 19% carried by the cover andextending into the washer. Above the washer I93 is a cup-shaped washer I95 that is keyed to the bearing portion 7 ofthe drum, see Fig. 14.

Arrat trap spring I98 is located intermediate the washer I93 and the underside of the washer I95 and has one of its ends fixed to the washer I90, whileits opposite end is attached vto the washer I05. The rat trap spring I96 is so arranged that rotation of the cam shaft I80 and drum I05 in a clockwise direction will tension .of the indicator portion of the housing I10 and a second bearing shaft portion I16 which bears the spring,- and unless the drum is held against reverse -rotation saidtensioned spring will cause said drum to rotate in an anti-clockwise direction until the stop pin I82 engages the stop screw Isl, at which time, of course, further movement ofthe drum in the anti-clockwise direction is stopped. I I

In order that the position of the cam I84 relative. to the drum I85 may be varied the following 'arrangement is utilized: outwardly of the the polygonal shaped portion I11 of the bearing shaft I18 of the gear segment I14. The gear seg- 1 meat 1'14 meshes with-a gear segment I19 formed on a pawl support I19 is mounted on the reduced lower end of a cam shaft I00, see gFig.g14. The pawl support I18 has an upwardly extend,-

ing arm I8I which carriesat its upper end'pivot-- ally-mounted pawls I82 and I80, the first of which will be referred to as an actuating pawl and the second as a retaining pawl. The functions of these pawls will becomemore apparent hereinafter.

The reduced lower end of the camshaft I80 is I extends through an opening in the. cover I04.

The stop drum I85 adjacent its lower end is provided'with an annular groove I88 forming at the lower end of the drum a flange I01, a-por cup-shaped washer I98 an operation indicating knob I01 is splined to the reduced upper. end of the cam shaft I and is normally urged toward. -the washer I98 by means of a spring I98 surrounding the end of the cam shaft I80 within formed in the outer end of the knob a recess and abutting against said knob and a retainer plate .or washer shaft I80. The outer end of the stop drum I is provided with serrations or teeth 200 which, due to the spring I98, arenormally interengaged with similar serrations or teeth 20I formed on the inner end of the hub portion of the knob I91 (see Fig. 22), The teeth or serrations200 and MI are spacedin degree circumierentially a distance equal to the circumferential spacing of the teeth I88 that are in the-flange I81 of the drum It will be seen that when the knob I 91 is pulled outwardly against the action of the spring I98 so as to disengage the teeth 200 and MI the cam shaft I80 can be rotated by the knob independently of the drum I88 to change the relationship between the cam I84 andsaid drum and when the cam has been positioned in a predetermined location and the outward pull on the knob releasedthe spring I98 willeffect a reengagement of the teeth 200 and 20I and the cam will be positioned in the adjusted predetermined location relative to the drum.

As will later become more apparent, the loca- I08 secured to the end of the tion of the cam I84 with respect to the drum I85 is determined by the number of steps in theoperative cycle, since said cam functions to release the drum and allow itto be restored by the rat trap spring I96 to its initial position, i. e., the position required for the first operative step.

In order that the relative location of the cam I84 with respect to the drum I85'may be visually determined and indicated, the cup-shaped washer I85 is provided on its periphery with a series of numerals indicating the .operative steps, while the fixed washer I93 has on its periphery a fixed pointer line 202 to cooperate with said numerals and with a pointer line 203 located on the periphery of the knob I91.

It will be understood that the knob I91 can be pulled out and turned to bring the pointer line 203 in line with any one of the numerals corresponding to the number of operative steps in the work cycle and then released, at which time the cam will be properly positioned to function to release the drum for restoration to its initial position upon the completion of the said number of operative steps.

Referring to Fig. 20, the pointer line 203 on the knob II is positioned over the numeral 4, since it has been assumed that there are four operative steps in the workcycle; and it will be noted that the fixed pointer line 202 is beneath the numeral 4, indicating that the fourth step of the cycle has been reached. I

It will be understood that when the drum returns to its initial position upon the completion of the fourth step in the cycle the fixed pointer line 202 will lie beneath the numeral I and as the second and third operative steps are initiated said fixed pointer line will lie respectively below the numerals 2 and 3, to indicate the current operative step at which the machine is functioning.

The drum I85 is provided on its external surface in this instance with eight spaced notches, four of which are shown in Fig. and indicated at 204, 204a, 204D and 2040. These notches are spaced in degree circumferentially of the drum a distance corresponding to the spacing 'of the teeth I88 formed in the flange I8! of the drum I85. It will be understood that the remaining four notches do not appear in Fig. 20 as they lie behind the drum I85. The notches are also spaced axially of the drum I85 so that each notch is in horizontal alignment with a pivoted stop finger, indicated in Fig. 20 at 205, 205a, 205b, 2050, 205d, 2052, 205 and- 205g, rockably mounted ona shaft 206 supported in the lower portion of the housing and the cover plate I34, it being understood that there are eight of the stop fingers to correspond to the eight notches in the drum I85 and representing the eight different operative steps in the work cycle.

The stop fingers are normally urged toward the drum I85 by spring-pressed plungers 20I arranged in a vertical series within the housing, so that when any one of the stop fingers registers with its cooperating notch during clockwise movement of the drum I85 it will move into the same to hold the drum against anticlockwise movement aswill later be pointed out more fully, (see Figs. 12 and 20) Each stop finger is provided also with a stop portion 208 which when the stop finger is in engagement with its notch in the drum I85 lies in the path of movement of the lug I64 on the disk I63 which is correlated to the same operative step in the work cycle. as the particular stop finger.

Assuming that viewed in Fig. 13, 'is so located that its lug I 64 is not in engagement with the stop portion 206 of the stop finger 205, then upon the motor I40 being operated said disk I53 will rotate in an anti-clockwise direction until the said lug I64 engages the stop portion 208, whereupon further rotation of the uppermost disk I63 will be stopped as well as further rotation of the sleeve I56 which carries the disk and the worm wheel I55 that is clutched thereto, with the result that the worm shaft I52 will move endwise against the action-of the spring-pressed plunger I53 andeffect a disengagement of the friction clutch elements I50 and I5I, the motor continuing to operate however.

Assuming that an indexing movement in a clockwise direction is given to the drum I by mechanism later to be explained, it will be seen that the stop finger 205 will ride out of its notch 204 and said stop finger will travel on the periphery of the drum I85, thus being rocked against the action of its spring-pressed plunger 201 and withdrawing the stop portion 208 from engagement with the lug I64 of its companion disk I63, as viewed in Fig. 12.

The indexing movement just referred to imparts a partial rotation to he drum I85 until the stop finger 205a engages in the notch 204a to prevent reverse rotation of the drum I85 in an anti-clockwise direction upon the termination of the indexing movement, at which time the stop portion 208 of the stop finger 205a will lie in the path of travel of the lug I64 of the second disk I63 which is related to the stop finger 205a.

As soon as the stop portion 208 of the stop finger 205 has been moved out of engagement with its companion 1ug-I64.the companion disk I63 is free to rotate, whereupon the springpressed plunger- I53 moves the worm shaft I52 axially to engage the clutch elements I50 and I5I to operatively connect the motor I49 to the sleeve I56 and the disks carried thereby, whereupon said sleeve and all they disks rotate. This rotation of the sleeve I56 and the disks I63 continues until the lug I64 on the disk I63 that is companion to the stop finger 205a engages with the stop portion 208 of said finger which, of course, operates to stop further rotation of the disks and sleeve and automatically causes the worm shaft I52 to move axially against the action of the spring-pressed plunger I53 to disengage the friction clutch connection .to the mo lugs I64 carried therebyhave been arranged in predetermined relative positions with respect to the sleeve I56 related to the difierent spindle speeds in the different oprative steps and that said sleeve I56 is operatively connected through gearing with the shaft II9 which, in turn, is

operatively connected with the indicating drum- I21 and said-drum will be indexed with the sleeve I56 in equal degree so that the indicator will the uppermost disk I63, asw

show the particular speeds provided it is not opposite ends tapered and its upper end is adapt- -ed to engage in a series of circumferentially spaced openings 2I0 formed in the bottom of the indicating drum I21, see Figs. 11 and 14, there being as many openings 2 I as there are indicating positions on the indicating drum. In this instance twelve openings are provided since there are twelve different spindle speeds. The lower end of the lock bolt 209 extends into a horizontal bore 2 arranged at right angles to the vertical bore and in said horizontal bore there is slidably mounted a shouldered actuating pin 2I2 having at its inner end a tapered portion cooperatingwith the tapered lower end of the lock bolt to cam said bolt upwardly into an opening 2I0 when inward endwise movement is imparted to the actuating pin 2I2.

The outer end of the actuating pin 2I2 is provided with a tapered camming portion 2I3 adaptedto cooperate with a normally fixed cam 2I4 carried by a support 2I5 that is rockably mounted on the sleeve I62 and is provided in one of its arms with an opening in which is mounted a bushing 2I6 having a tapered portion at the upper end. of the bore therethrough.

The tapered lower end of the clutch actuating pin I58 is adapted, when said pin is in clutch engaged position, to extend into said bushing,

rocked from the position shown in Fig. to the position shown in Fig. 16, at which time the tapered end 2I3 of the actuating pin 2I2 has moved off of -the fixed cam 2 I4 and the lock bolt 209 has moved to retracted position to allow the indicatingdrum to rotate under the action of the spring I45 until the spindle speed 'which has been preselected by ,the indexing of the spools 92 is in line with the fixed pointer of the indicating device, that is, the indicating device will now indicate the spindle speed which has been preselected. When the spools 92 are again with the result that the support 2I5 is held against rocking movement on the sleeve I62. If the clutch actuating pin I58 is screwed outwardly to clutch disengaged position, the tapered lower end of said pin will lie in the tapered upper end of the bore through the bushing 2I6, at which time the support 2I5 can rock from the position shown in Fig. 15 to that shown in Fig. 19 and when in the latter position the cam 2I4 is' out of operative relationship with the tapered end 2I3 of the actuating pin 2I2. At this time, due to the tension of the spring I45 and the tendency of the indicating drum I21 to rotate, the lock bolt 209 is forced to unlocked position and the drum is free to rotate. The condition just referred to is obtained when it is desired to manually index the spools 92 without utilizing the mechanism for automatically indexing the same. The movement of the clutch actuating pin I58 to clutch engaged or clutch disengaged position is limited by means of a limit or stop pin 2I1 carried by the sleeve I58 and located intermediate axially spaced shoulders on the pin I58.

It will be seen that when the support 2I5 is locked against rocking movement by the pin I58 and is in the position indicated in Fig. 15, as is also the gear'segment I14, then the tapered end 2I3 of the actuating pin 2I2 is in engagement with the fixed cam 2 and said actuating pin has been forced inwardly in the horizontal bore so that its inner end cooperates with the lower end of the lock bolt 209 and cams said bolt upwardly until the tapered upper end thereof is in one of the openings 2I0 and the indicating drum is held against rotative movement.

When the spools 92 are in their outer or separated positions and the equalizer bar I03-is rocked to move said spools inwardly or toward each other, the gear segment I14 being operatively connected with the equalizer bar I03 is moved from their inner or actuating position to their separated or indexing position the rocking of the equalizer bar I03 to effect such movement will rock the gear segment I14 from the position shown in Fig. 16 back-to the position shown in Fig. 15, at which time the actuating pin 2I2 contacts the fixed cam 2I4 and the lock bolt is again cammed into locked position with its tapered upper end in one of the openings 2I0.

From the foregoing it will be observed that when the spools are in indexing position, i. e., their separated positions, the indicating drum is held against rotative movement, and consequent- 1y indexing .of said spools while in such position does not rotate the drum but merely rotates the shaft I I9 and tensions the spring I45 by the camming action of the roller I4I on the lower cam edge of the cam member I44. As soon as the spools 92 move toward each other to actuating position to obtain the spindle speed which has been preselected, then the lock bolt 209 is withdrawn and the indicating device will rotate to indicate the spindle speed previously preselected. It will be remembered, as previously explained, that the rotation of the indicating drum to the indicating position just referred to is stopped by the engagement of the roller I in the V-notch of the cam I44, as indicated in Fig. 24.

As previously stated, the segment I14 is in mesh with the segment I18 formed on the pawl support I19 and which support isprovided with an upstanding arm I8I at the upper end of which are the actuating pawl I82 and the retaining pawl I83.

When the stop drum I is in the position shown in Fig. 12, with the stop I92 in engagement with the stop screw I9I and the spools 92 are intheir outer or indexing position, the actuating pawl I82 and the retaining pawl I83 will be in the position shown in Fig. 18. It will also be understood that the device having been set for four operative steps in a work. cycle, as

indicated on the operations indicating knob shown in Fig. 9, the cam I84 will be positioned as indicated in Fig-18, that is,-with the cam edge of said cam located four teeth I88 from the tooth first engaged by the hook portion of the actuating pawl I82. At this time the pin I89 is in engagement with the retaining pawl I83, as indicated inFig. 18, and has unhooked said pawl from the actuating pawl I82.

Assuming that the operator moves the main control lever to effect an inward movement of the spools 92, the rocking of the equalizer bar I03 to attain this end will rock the gear segment I14 and, in turn, the segment I18 and pawl support I19. This rocking movement of the pawl support causes the actuating pawl I82 to ride out of engagement with the first tooth I88 and into engagement with the second tooth I 88, the spring pressed plunger 2I8 carried by the retaining pawl I83 forcing the hooked portion, of the actuating pawl into engagement with the second tooth,

while the shoulder 2I9 of the retaining pawl bears upon the outer side of the actuating pawl and the hook of the retaining pawl has moved rocked but in the opposite direction from that'- previously' described, with the result that the actuating pawl I82 indexes the stopdrum I85 one tooth space in a .clockwise direction, as viewed in Fig. 16. This indexing movement of the stop drum causes the stop finger 205 to ride out of the notch 204 onto the periphery of the drum I85 and just as the indexing movement is completed the stop finger 205a will drop into the notch 204a to prevent anticlockwise drum I85.

2% soon as the stop finger 205 has ridden out of the notch 204 the stop portion 208 is disengaged from the lug I64, with'the result that the first stop disk I63 travels with the sleeve I56, whereupon the spring plunger I53 can act on the worm shaft I52 to engage said shaft with the motor I49 to effect a power rotation of the sleeve and disks I63 until the stop lug I84 of the second disk I63 engages with the stop portion 208 of the stop finger 205a, whereupon the friction drive from the motor I49 is interrupted. As previously movement of the stop I described, the sleeve I56 is operatively connected with the spools: wherefore it will be understood that the power rotation of the sleeve just described effects a predeterminedindexing movement of the spools 92 to preselect the spindle speed for the second operative step in the work cycle.

It will also be recalled that the shaft II9 will have been rotated a predetermined distance to tension the spring 145 so that the indicating drum I21 will be rotated to the preselected spindle speed as soon as the lock bolt 209 is withdrawn.

At the completion of the first operative step the operator moves the main control lever to dis engage the main driving clutch and then moves said lever to effect an inward movement of the spools 92 to obtain the speed preselected. This inward movement of the spools effects a with- I main driving clutch and initiate the second operative step of the cycle, and then moves said lever to eflect an outward movement of the spools 92 to again index the stop drum I85 to its third position in the manner described for the indexing of said stop drum for the second position and the operation is continued in the same way until the end of the fourth operative step of the work cycle.

As the machine is being operated successively through the four operative steps, as has been explained, the cam I84 has been moved step by step from the position shown in Fig. 18 to the position shown in Fig. .15, wherein the actuating pawl is in engagement with the fourth tooth I88. Upon the completion of the fourth operative step in the cycle the operator moves the main control lever to disengage the main driving,

clutch and to effect an inward movement of the spools 92 to cause the pawl support I19 to move in an anti-clockwise direction, with ,the result that the actuating pawl I82 rides out of engagement with the fourth tooth I88 and upon the cam I84, and rocks theretainingpawl I83 until the hooked end of the actuating pawl interlocks with the locking portion 220 of the retaining actuating pawl I62 has moved radially inwardly,

wherefore when the operator through the main control lever causes the spools 92 to move outwardly to indexing position the resultant clockwise movement of the pawl support I'I9 with the actuating pawl I82 and retaining pawl I83 in the relationship'shown in Fig. 16 causes said other end of the actuating pawl I82 to engage with the lower arm portion 22I of a rockably supported Imockout plate 222 which is in contact with a third portion 223 of all the stop fingers, see Figs. 17 and 23, to move the fourth stop finger 2050 out of contact with the fourth notch 204c.

It will be understood that the purpose of having the knockout plate 222 contact with the third extending portion 223 of all the stop fingers is that no matter which stop finger is holding the drum, depending upon the number of operative steps in the work cycle, said knockout plate will function to move the same out of engagement with the particular notch in the drum.

As soon as the fourth stop finger 20.50 has thus been rocked to release the drum I and allow it to have anti-clockwise movement, the rat trap spring I96 functions to impart such movement to the drum and rotate the same until the stop pin I92 contacts with the stop screw I9I and furtheranti-clockwise movement of the drum is arrested. During the indexing movement of the drum, as previously explained, the pin I89 has moved step by step in a clockwise direction from the position shown in Fig. 18 to the positionshown in Fig, '17. During the last portion of the anti-clockwise movement of the stop drum I85, the pin I89 moves to its former position and again comes into contact with the surface, of the retaining pawl I83, as indicated in Fig. 18, and rocks said pawl to release the locking portion 220 from the actuating pawl I82, whereupon the hook portion of the actuating pawl under the pressure of spring plunger 2I8 again engages with the first tooth I88.

The movement of the hooked end of the actuating pawl I82 into engagement -with the first tooth I88 disengages the other end of said actuating pawl from the arm 22I of the knockout plate 222, with-the result that said plate will be rocked by the action of the stop finger 205 under the pressure of the spring plunger 201 from the position shown in Fig. 17 to the position shown in Fig. 16, at which time the stop finger 205 will en- V gage in the notch 204 and the parts are now rea stored ,to starting position from whence the machine can again function through the four operative steps of the complete work cycle. It will also be understood that the cam I84 moves during the anti-clockwise rotation of the drum I85 from the position of Fig. 17 back to its position in Fig. 18.

It will be understood that when the moves the main control lever to effect an inward operator movement of the spools 92 the spindle speed pre When it is desired to operate the machine withmanual'selection. or preselection ofthe spindle speeds, the operator screws the clutchactuating pin I59 outwardly to disengage the tapered lower end thereof from the bushing 2I6, which act also disconnects the worm wheel I55 from the sleeve I56. Likewise the lock bolt 209 will now be inactive. It will be understood, of course, that during manual selection or preselection of the spindle speeds the motor I49 is not operating.

When the conditions just set forth have been attained the operator selects or preselects the various spindle speeds by manually rotating the hand wheel 93 when the spools 92 are in their outer or indexing position, and such rotation of the hand wheel 93 effects a rotative movement of the indicating drum I21 to indicate the speed selected or preselected, it'being understoodthat the drum I21 will now rotate with the shaft II9 due to the roller Ill being located in the V of the cam I and the restraining effect of the lock bolt being absent.

Diu'ing the manual indexing of the spools 92 to select or preselect the spindle speeds, the sleeve I56 and/or the disks I63 will .be rotated in a clockwise direction and any engagement between the lugs I64 and the stop portions of the stop fingers will merely rock said fingers on their pivots and also the spring-pressed plungers I66 will simply idle over the teeth I65 of the disks I63.

It will be understood that the inward and outward movements of the spools 92 and the control of the main driving clutch is obtained by the heretofore described movements of the main control lever I2. During the manual selection and preselection of the spindle speeds the elements of the mechanism for automatically selecting or preselecting said speeds may idly move in accordance with the last setting of the device or obtaining automatic selection or preselection, but do not have any effect on the manual selection or preselection of the spindle speeds as just referred to.

When it is desired to have the unit attachment automatically select or preselect the different spindle speeds, the disks I63 on the sleeve I56 are adjusted in predetermined relative positions correlated to the different spindle speeds in the different operative steps and also the cam I84 is positioned in a predetermined location with respect to the drum I85 as has been previously explained by means of the knob I9'I. The

"selected for the flrstfloperative step will be obferent'operative steps, it being understood that the inward and outward movements of the spools 92 to actuating or indexing position as well as the controlof the main driving clutch are obtained through the movements of the main control lever I2.

It will also be recalled that when a spindle speed is preselected the indicating drum I2! is always indicate the spindle speeds and cutting operator then screws the clutch actuating pin I58 inwardly to connect the worm wheel I55 to the sleeve I56 and to positionthe lower pointed end of the pin in the bushing 2I6 which positions the support 2I5 and cam 2 It with respect to the shoulder actuating pin 2I2 to render the lock bolt 209 eflective. The operator will then speeds in feet per minute and the current operative step in the work cycle will be indicated.

In the manual selection or preselection of the spindle speeds, the different operative steps will .be indicated by the blocks I39, while in the auto- 7 matic selection or preselection of the spindle speeds the different operative steps in the work cycle will be indicated either by the numerals on the cup-shaped washer l or by the blocks I39.

It will be understood that in most instances the machine will be operated with automatic selection or preselection of the. spindle speeds and such operation is the preferred one. It will be appreciated that the automatic selection or preselection of thespindle speeds is advantageous and materially adds to the efliciency of operation of the machine.

Although a preferred embodiment of the invention has been illustrated and described herein, it will be understood that the invention is susceptible of various modifications and adaptations within the scope of the appended claims.

Having thus described my invention, I claim:

1. In a machine tool having a part to be moved at different speeds in the operative cycle, movable means operable for selecting or preselecting thedifferent speeds for said part and including a plurality of preadjusted stop members and a plurality of stop fingers corresponding in number to' said members and cooperating withthe latter for stopping movement of said movable means in different positions correlated to the different speeds of the movable part in the operative cycle. i

2. In a machine tool having a part to be moved at different speeds in the operative cycle, movable means operable for selecting or preselecting the different speeds of said part and including an element provided witha plurality of preadjusted stop members, and a plurality of stop fingers corresponding in number to said-members and cooperating therewith to stop the movement oi. said element at various positions correlated with respect to the differentspeeds of said movable part. I

3. In a machine. tool having a part to be moved at different speeds in the operative cycle, movable means operable for selecting or preselecting the different speeds of said part and including an element provided with a plurality of preadjusted stop members, a plurality of stopfingers corresponding in number to said members, and an indexible member cooperating with said stop fingers to position one of said stop fingers at a timein cooperative relationship with one of said stop members to stop movement of said element in various positions correlated with respect to the different speeds of said movable part.

4. In a machine tool having a part tobe moved at different speeds in the operative cycle, movable means operable for selecting or preselecting the different speeds of said part and including an element provided with a plurality of pread- "corresponding in number to said stop member,

an indexible member cooperating with-said stop fingers to position one at a time thereof in cooperative relationship with one or another of said stop members, a manually operated means, and an operative connection between said manual means and said indexible member whereby movement of the former actuates said indexible member to position one or another of said stop fingers.

5. In a machine tool having a part to be moved at difierent speeds in the operative cycle, movable means operable for selecting or preselecting the difierent speeds of said part and including an element provided with a plurality of preadjusted stop members, stop fingers corresponding in number to said members, an indexible' member, manually operated means for indexing said-last member in one direction to sequentiallyposition one at a time of said stop fingers in cooperative relationship with a respective stop member to stop the movement ofsaid element in various positions correlated to the diflerent speeds of said movable part, and spring means for moving said indexible member in the opposite direction.

6. In a machine tool having a part to be moved at difierent speeds inthe operative cycle, movable means operable for selecting or preselecting the difierent speeds of said part and including an element provided with a plurality of preadjusted stop members corresponding in number to the operative steps in the cycle, a corresponding number of stop flngeraan indexible member for an element provided with a plurality of preadjusted stop members, a plurality of stop fingers co responding in number to said members, an indexible member, manually operated means for indexing said last member in one direction to move one or another of said stop fingers into cooperative relationship with one or another of said stop members to stop'the movement-0t said element in various positions correlated with respect to the diiferent speeds of said movable part,

and spring means for rotating said indexible member in the opposite direction, said one or the other of said stop fingers acting to restrain said indexible member against movement under the action of said spring. 1

7. In a machine tool having a part to be moved I at different speeds in the operative cycle, movable means operable for selecting or preselecting the different speeds of said part and including an element provided with a plurality of preadjusted stop members corresponding in number to the operative steps in the work cycle, a corresponding number of stop fingers, an indexible member, manually operated means forindexing said last member in one direction and by predetermined increments to operatively position one or another of said fingers in operative relationship with one or another of said stop members to stop the movement of said element in various positions correlated with respect to the different speeds of said movable part in the various steps 'of the cycle, spring means tending to rotate said in- "dexible member in the opposite direction, said stop finger which is currently acting as a stop also restraining rotation of said indexible member under the action of said spring, and means associated with said element for releasing all of said stop fingers at theend of the operative cycle whereby said indexible member is free to be moved by said spring.

8. In a machine tool having a part to be moved at difierent speeds in the operative cycle, movable means operable for selecting or preselecting the difierent speeds of said part and including operatively and sequentially positioning certain 01' said fingers to engage certain of said stop members to stop movement of said element in various positions correlated to the difierent speeds of the movable part, manually operated means for indexing said indexible member in one direction and in predetermined increments and including a pawl cooperating with teeth on said indexible member, and a cam adjustably positioned relative to said indexiblemember for releasing said pawl at the end, of the operative cycle, and spring means for returning said indexible member to its initial position;

'9. In a machine tool having a part to be moved able means operable for selecting or prl electing the different speeds of said part and including an elementprovided with a plurality of preadjusted stop members, an indexible member, a

plurality of stop fingers, and manually operated means for indexing said indexible member 'in one direction' step by step to operatively position said stop fingers one at a time in cooperative relationship with one or another of said stop membersv to stop the movement of said element in various positions correlated with respect to the difierent speeds of said movable part, said means including a pawl cooperating with ratchet teeth formed on said indexible member, a cam for moving said pawl to an inactive position at the end of the cycle, and a second pawl for retaining the first; pawl in said inactive position, means operated by said first pawl when in the inactive position to move allofsaid stop fingers to an inoperative position, and spring means for retuming said indexible member to its original position when said stop fingershave been thus moved.

' 10. In a machine tool having a part to be moved at different speeds in the operative cycle, movable means operable for selecting or preselecting the dififerent speeds of said part and ,including an element provided with a plurality of preadjusted stop members, an indexible member, a plurality of stop fingers, and manually operated means for indexing said indexible member in' one direction step by step to operatively position said stop fingers' one at a time in cooperative relationship with one or another of said stop members to stop the movement of said element in various positions correlated with respect to the different speeds of said movable part,

said means including a pawl cooperating with ratchet teeth formed on said indexible member, a cam for moving said pawl to an inactive position'at the end of the cycle, asecond-pawl for retaining the first pawl in'said'inactive position,

at different speeds in the operative cycle, movable means operable for selecting or preselecting the difierent speeds of said part and including 

